Planoorapm co



F. A. COLEMAN AND L. 0. AMBROSE. SAFETY DEVICE FOR CORE OVEN D0088.

APPLICATION FILED APR. 4.19m-

Patented Sept. 2, 1919.

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Il ea" l I I. zawmumjgg/fi F. A. COLEMAN AND L. 0. AMBROSE.

SAFETY DEVICE FOR CORE OVEN DOORS.

APPLICATION FILED APR. 4.19m.

Patented Sept. 2, 1919.

2 SHEETS-SHEET 2.

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FREDERICK A. COLEMAN, OF SHAKER HEIGHTS, AND LEE 0. AMBROSE, OF CLEVELAND, OHIO, ASSIGNORS TO THE FOUNDRY EQUIPMENT COMPANY, OF CLEVELAND, OHIO,

A. CORPORATION OF OHIO.

Specification of Letters Patent.

Patented Sept. 2, 1919.

Application filed April 4, 1918. Serial No. 226,784.

To all whom it may concern:

Be it known that we, FRnDnRIoK A. Conn MAN and LEE 0. AMBROSE, citizens of the United States, residing at Shaker Heights and Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Safety Devices for Core-Oven Doors, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

his invention relates to safety devices for core oven doors. It is a common practice to provide core ovens with large vertically raisable doors suspended by cables and suitably counterbalanced, and in the operation workmen are obliged to expose themselves to dan er from inadvertent dropping of the door, due to breaking of one or more of the cables. The purpose of this invention is to provide means for automatically locking the door against lowering movement consequent upon the breaking or loosening of any of the suspending cables. 7

Another object of the invention is to render such a device simple and capable of being cheaply installed, and arranged to avoid iinterfering with the normal operation of the cor.

In using the door suspended by more than one cable, it is customary to provide a balance weight for each cable, so that each weight may counterbalance its proportion of the door and it is obvious that the breaking or loosening of any one cable renders one of the counterbalancing weights inactive, thus disturbs the balance and allows the door to drop suddenly with substantially as great a danger as though all the weights were removed at once.

It is a further object of this invention to connect our safety device with each cable so that it will invariably operate upon the failure of any one of the balancing cables or weights.

Other objects will become apparent in the following description which illustrates a convenientv embodiment of our invention.

. The essential characteristics are summarized in the claims.

In the drawings, Figure 1 is a front ele- -vation of our door in position showing the same nearly closed Fig. 2 is a side elevat on (of the door idew y .eoun a a pl g weights; Fig. 3 is an enlarged detail of the safety device operating mechanism, illustrating one of the operating members connected with the cable; Fig. 4 is a detail of one) of the operating members showing its connections with the locking dog; Fig. 5 is a transverse section through the operating member being taken substantially on the line 55 of Fig. 1; Fig. 6 is a plan of the parts shown in Figs. 4.- and 5, showing the guide for the door in cross section.

Describing the parts by the use of reference numerals, the door illustrated in the drawings comprises a rectangular frame having upper and lower channel beams 1 and 2, respectively, connected by the vertical side members 3 and 4. These top, bottom and side members are preferably structural channels or angles connected at the corners by suitable gusset plates, such as 5, and the frame is rendered rigid by the use of the vertical beams 7, and an intermediate cross beam 8, the beams 7 being connected with the top and bottom beams by the gusset plates 9', while at the intersections of the beams 7 and 8 suitable brace plates 10 are secured. Plates 11 connect the beam 8 to the side members 3 and 4., thus forming an open frame which may be closed to form the door, by filling the spaces with suitable refractory material 12.

As illustrated, the guide for the door comprises channel beams 15, the flanges of which turn outwardly from the door and on the forward flange of which are mounted two strips 16 and 17 spaced apart by the narrower strips 18 thus forming an inwardly facing channel or groove for embracing a flange on each edge of the door. Such a flange is provided by the use of an angle strip 20 having one flange secured to one of the side members, and its outwardly turned flange is loosely embraced between the strips 16 and 17.

The core oven to which our door is illustrated as being fitted, may have suitable walls 32 and a front wall 33 having an opening 3 1 closed by the door, the channels 15 being built into or set back upon the side walls sufficiently to bring the door into close proximity to the front wall. A strip 28 on the top beam 1 of the door may extend 1nwardly, rendering it close to the front wall, allowing the body of the door to clear the wall while closing the space between the wall and the top of the door. A similar strip 29 may be used on the bottom beam 2, as shown.

Secured to the top beam 2 of the door are a series of eyes 22 receiving closed loops at the ends of cables 2%. These cables are shown as led upwardly over pulleys 25 and carrying at the other end weights 30 which taken together fully counterbalance the weight of the door. The pulleys 25 are car ried in suitable hangers 26 mounted on supports 27. It is obvious that any suitable arrangement of pulleys and weights may be use lVhen using the core oven the door is raised to a suitable height permitting access through the opening, and the workmen frequently expose their persons beneaththe.

ment shown in the drawings, is as follows:

Extending transversely of the door on the upper part thereof, is a shaft 40, preferably hollow, having bearings in outwardly turned flanges of angle plates 42' secured to the vertical beams 7 and the side beams 3 and 4:. On this shaft is an arm 45 extending outwardly and upwardly therefrom and connected by a small flexible member 47 with the cable and with an eye 48 on the arm. The structure of the arm is preferably that of a channel member having a connecting web and upwardly turned flanges 49 provided with openings embracing the shaft l0. On the web of the arm is secured a pin 7 50 extending through a slot in the shaft, illustrated at 51, allowing a relative movement of the shaft and arm. Suspended from the outer end of the arm by a suitable member 54: is a'weight 55. At each end of the shaft 40 and rigid therewith is a short dog 60 having a series of teeth adapted to engage the outer strip 17 of the guide at the side of the door. It will be seen that upon releasing. any one of the arms, allowing-the weight 55 to draw the same downwardly, the pin 50 will turn the shaft forwardly, throwing the dogs 60 inwardly into close engagement with the strip 17 As the length of this dog is such that it cannot turn past horizontal position the inward component due to the downward pull of the door urges the teeth of the dog into more close engagement with'the guide.

At the lower portion of the door is a transverse shaft mounted in outwardly turned flanges of clip 7 2 secured to the vertical members 7 and to the side members 3 and 4. This shaft also carries at each end dogs 80, rigid on the shaft and made similar to the dogs 60 and adapted to act in the same manner. The dogs 60 and 80 are connected by links 85, pivoted at 86 to the lower dogs and at 87 to the upper dogs, whereby the actuation of either of the upper dogs will move the corresponding dog 80 into active position.

This construction provides for engaging the guides at separated points at each side of the door, renders the locking more positive and insures against any danger consequent upon. failure of either set of dogs.

The releasing of any one of the cables 24: permits the slaclmess of the cable to allow the weight 55 to move an arm 45 downwardly to the position shown in broken lines in Fig. 3. This movement of the arm 45, through the pin 50, causes a partial rotation of the shaft 40 throwing the dogs 60-into engagement with the guides and consequently actuating the dogs 80 bringing them also into engagement. The loose connection of the pins 50 and the slots 51 in the shaft 4:0 is such that'a downward movement of any one of the arms may .turn the shaft forwardly to actuate the dogs while this looseness allows the relative movement of the shaft with relation to the other arms still held in their normal posi tion. In other words while the shaft may be turned forwardly with relation to any one of the arms yet the forward and downward movement of any arm must turn the shaft.

Having thus described our invention what we claim is z- 1. The combination with a door, upright members adjacent to each edge thereof, a rock shaft extending transversely of the door, dogs movable by the rock shaft and adapted to engage the upright members a plurality of members each adapted to rotate the rock shaft independently of the others, a plurality of flexible supporting members for the door connected with it, and a connection between each, supporting member and a corresponding'one of the members which may rock the rock shaft.

2. The combination of a door, vertical guideways at each side of the door, a plurality of flexible members for suspending the door, a rock shaft extending transversely of the door, dogs rigid on theshaft andadapted to engage the guideways, a plurality of outwardly extending arms journaled on the shaft and having a loose motion connection therewith, said arms tending to fall and rock the shaft, and a connection between each arm and the corresponding flexible "member.

3. The combination of a door, vertical guideways at each side of the door, a plural- 1ty of suspending cables for the door, a rock shaft extending transversely of the door, dogs rigid on each end of the rock shaft and adapted to engage the guideways, a plurality of outwardly extending arms ournaled on the shaft and having a loose motion connection therewith, said arms tending to fall and rock the shaft, a connection between each arm and the corresponding cable for holding the arm inactive, said loose motion connection being such that the shaft may be rocked by any arm without disturbin the others.

4:. The com ination of a door, upright guideways at each side thereof, a plurality of flexible suspending members secured to the door, locking elements at each side of the door adapted to engage the guideway to prevent fallin movement of the door, means for actuatlng said elements simultaneously, consequent upon the failure of either of the flexible members, said means including a rock shaft carrying the locking elements and individual weighted arms having loose motion connections with the rock shift and independently connected to the ca les.

In testimony whereof, we hereunto afiix our signatures.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of latents, Washington, D. G. 

